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Roll slitting
Roll slitting
Roll slitting
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Slitter rewinder

Roll slitting is a shearing operation that cuts a large roll of material into narrower rolls. There are two types of slitting: log slitting and rewind slitting. In log slitting, the roll of material is treated as a whole (the 'log') and one or more slices are taken from it without an unrolling/re-reeling process. In rewind slitting, the web is unwound and run through the machine, passing through knives or lasers, before being rewound on one or more shafts to form narrower rolls. The multiple narrower strips of material may be known as mults (short for multiple) or pancakes if their diameter is much more than their width.[1]

For log slitting, the machine used is called a paper roll saw, which typically uses a circular saw or band saw to cut rolls into narrower ones. For rewind slitting, the machine used is called a slitter rewinder, a slitter, or a slitting machine – these names are used interchangeably for the same machines. "Slitting" refers to the process of industrial cutting the material web in a lengthwise direction, while "cutting" refers to both lengthwise and crosswise cutting operations. The roll slitting machine is called a slitter or slitter-rewinder, rather than a cutter, due to this distinction. For particularly narrow and thin products, the pancakes become unstable, and then the rewind may be onto a bobbin-wound reel: the rewind bobbins are much wider than the slit width, and the web oscillates across the reel as it is rewound. Apart from the stability benefit, it is also possible to put very long lengths (frequently many tens of kilometres) onto one bobbin.

Dual Shaft Slitting machine
Dual Shaft Slitting machine

Process

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Soft materials

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Several methods are available for soft materials like plastic films, textiles, adhesive tapes, and paper. Razor blades, straight, or circular blades are being used. Some blades cut through the material while others crush the material against a hard roll. Those are similar to knives. The cutting blades can be set to a desired width. Some machines have many blades and can produce a number of output rolls at once. The slit material is rewound on paper, plastic or metal cores on the exit side of the machine.

The process is used because of its low cost and high precision for mass production. Some machines have a program that monitors the blades and sharpens the blades often to maintain the quality and precision of the cut. Depending on the industry and the product that is being slit these machine can run between 10m/min (special metal webs) and 1000 m/min (paper making process). The machines can also incorporate extensive automation to precisely control material tension, automatically position the slitting knives, automatically align the cores onto which the material is wound and to reduce manual handling of the rolls.

Examples of materials that can be cut this way are: adhesive tape, foam, rubber, paper products, foil, plastics (such as tarps and cling wrap), glass cloth, fabrics, release liner and film.

Hard materials

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See also: Shearing (metalworking)

For harder materials, such as sheet metal, blades cannot be used. Instead, a modified form of shearing is used. Two cylindrical rolls with matching ribs and grooves are used to cut a large roll into multiple narrower rolls. This continuous production process is economical yet precise; usually more precise than most other cutting processes. However, the occurrence of rough edges known as burrs is commonplace on slit edges. Also, the geometry of these rolls is determined by specific tolerances in addition to the type of material and workpiece thickness.[2]

Machinery

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For metal coils, the slitter consists of three main parts: an uncoiler, slitter, and recoiler.[3] The material is fed from the uncoiler, through the nip between the two circular cutting wheels (one on top and another underneath), and then re-wound in slit pieces on the recoiler.

When the term "slitter rewinder" or "slitting machine" is used to describe the machine, the three parts are referred to as the unwind, the slitting section and the rewind. Slitter rewinders are normally used to slit plastic films, paper and metal foils. The unwind stage holds the roll stably and allows it to spin; it is either braked or driven to maintain accurate tension in the material. Some machines have a driven unwind which reduces the effect of inertia when starting to unwind heavy rolls or when the material is very tension-sensitive.

The slitting section has four main options:

  • Razor slitting, which is ideal for thin plastic films—the system is very simple and quick to set. Although the razor blades are of low cost, they need to be frequently changed to ensure a good quality slit edge.
  • Rotary shear slitting. Male and female circular knives, or as they are also called, top and bottom shear-cut knives, engage to give a scissor cutting effect. This system is used widely on paper, films and foils. Although the knives take longer to position, they stay sharp longer than razor blades. The setting time can be reduced by using an automatic knife-positioning system.
    Rotatry blade
    Rotatry blade
  • Crush cut slitting. A male knife runs against an anvil. The system works well with certain materials including non-wovens and foams.
  • Hot knife slitting. A heated round blade (similar to a score or crush cut blade) or sharpened piece of metal also runs against an anvil in order to cut through the material. The heat of the blade seals the edges without burning in order to prevent the material from fraying.

The rewind section also has options. The main type is centre winding using differential rewind shafts. These shafts are becoming universal on most slitting machines. The differential shafts ensure an even tension across the full width of the material. Closed-loop control of the winding tension using feedback from load cells provides the total tension-control system required for running tension-sensitive materials. Precise and accurate tension control is the key to good roll slitting. Modern machines use AC vector drives with closed-loop feedback from AC motors. When used with the correct control algorithms, they produce excellent results with the minimum of maintenance.

Industry usage

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Roll slitting is a technique heavily used by Converters (industry). The converter industry normally refers to companies who print, coat and laminate materials. A typical converter is a company that produces flexible packaging material for packaging food. This may involve purchasing large rolls of plastic film such as biaxially orientated polypropylene (BOPP) which is then printed to the customer's design and coated with cold seal adhesive for use on high speed packaging machines. This material is printed and coated in wide, large diameter rolls for maximum efficiency. The rolls are then slit, using a slitting machine, into smaller rolls of the size to be used on the packaging machine.[4]

See also

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References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Roll slitting

View on Grokipedia
from Grokipedia
Roll slitting is a shearing process in that cuts wide master rolls of flexible materials, such as films, papers, and foils, into multiple narrower rolls of precise widths using specialized slitter-rewinder machines. This technique enables the conversion of large parent rolls into usable sizes for downstream applications, maintaining material integrity through controlled tension and cutting mechanisms. The process typically begins with unwinding the master roll, followed by longitudinal slitting via blades or knives, and concludes with rewinding the slit strips onto new cores under regulated speed and tension to prevent defects like telescoping or edge burrs. Common methods include rewind slitting, which processes the material web in real-time for high-precision multi-width cuts, and log slitting, which involves sawing entire rolls like logs for high-volume, single-width production. Slitting techniques vary by material and requirements: shear slitting uses rotary blades for clean, precise edges on papers and films; slitting employs stationary or looped blades for cost-effective cuts on thin films and light papers; and crush or score slitting applies pressure between a blade and anvil for tougher materials like foams and tapes, though it may produce rougher edges. Web widths can range from 500 mm to over 3,000 mm, with operating speeds from 10 m/min for metals to 1,000 m/min for films, and width tolerances as tight as ±0.1 mm. Roll slitting is essential across industries including , , , and automotive, where it processes materials like BOPP films, adhesive tapes, nonwovens, and metal foils to create components such as labels, battery separators, and protective wraps. By customizing roll dimensions, it reduces waste, optimizes inventory, and enhances production efficiency in roll-to-roll converting operations. Advantages include superior edge quality, scalability for both narrow and wide formats, and adaptability to diverse substrates, making it a cornerstone of modern flexible material processing.

Fundamentals

Definition and Purpose

Roll slitting is a shearing operation that cuts a large master roll of flexible material into multiple narrower rolls of specified widths. This process is essential in converting industries, where wide parent rolls of materials such as , films, foils, textiles, or thin metals are transformed into precise, manageable sizes suitable for further or end-use applications. The core purpose of roll slitting is to enable the customization of material widths, allowing manufacturers to produce narrower rolls tailored to specific requirements while minimizing material waste and optimizing resource utilization. By dividing a single large roll into several smaller ones, it supports efficient downstream operations in sectors like , , and converting, where exact dimensions are critical for product compatibility and performance. At its foundation, roll slitting involves unwinding the master roll to feed the material through a cutting mechanism, followed by precise lengthwise incisions and rewinding of the slit strips onto separate cores. Tension control plays a pivotal in this sequence, maintaining consistent force on the web to avoid —such as wrinkling from insufficient tension or breakage from excess—thereby ensuring uniform quality across the output rolls. Overall, the technique delivers key benefits including enhanced production efficiency through high-speed , cost reductions via reduced and , and broad versatility for handling diverse flexible substrates.

Historical Development

Roll slitting emerged in the alongside the expansion of mills and industries during the , where wide webs of material required division into narrower rolls for practical use. The invention of the Fourdrinier paper machine in the early 1800s, which produced continuous sheets of , created a need for slitting processes to handle the resulting large rolls, initially through manual or semi-automated methods using basic rotary blades. In , similar manual cutting techniques evolved into simple rotary blade machines by the early to process fabric rolls more efficiently than hand shears. Advancements accelerated in the with the introduction of powered slitting machines in the early , incorporating electric motors to achieve higher speeds and reduce manual labor compared to steam- or water-powered predecessors. Post-World War II, progressed through electric drives and improved rewinders, enabling more consistent processing in growing industries like and . A significant innovation was the adoption of magnetic powder clutches for tension control, invented by Jacob Rabinow in 1947, which allowed stepless speed regulation but was limited by friction-induced heat at high speeds. By the 1980s, the shift to computer-controlled systems, including programmable logic controllers (PLCs), enhanced precision in blade positioning and tension management, addressing demands for diverse substrates driven by advances in . In the 1990s and 2000s, tension control evolved from magnetic powder clutches to inverter-based systems using dual frequency conversion motors, which maintained consistent tension as roll diameters changed and supported higher operational speeds without overheating issues. These developments were propelled by increasing needs in the and sectors for efficient handling of varied materials.

Slitting Methods

Log Slitting

Log slitting, also known as slitting, is a batch-oriented method in roll slitting that involves mounting the intact master roll—treated as a "log"—on a rotating shaft in a lathe-like setup, where circular knives or blades make precise lengthwise cuts parallel to the roll's axis to divide it into multiple narrower rolls without unwinding the material. This approach is particularly suited for high-volume production of single or limited widths, especially for stable, thick, or rigid materials, as it allows quick setup and rapid cutting cycles. The mechanics rely on rotating the mounted roll while advancing the knife(s) axially to execute clean longitudinal cuts, ensuring high precision in width and minimal material deformation or tension stress. Equipment often includes single-knife or multi-knife slitters, with features like systems and automated blade sharpening for consistent quality. Key advantages include reduced edge damage from the non-tensioned cutting action, which is beneficial for materials prone to cracking or compression, fast throughput for high-volume runs, and the ability to produce uniform narrower rolls directly for secondary operations like trimming. Limitations include unsuitability for tension-sensitive or delicate webs that require inline control, the need for frequent blade maintenance (e.g., due to residue buildup), and potential limitations on roll diameter or edge smoothness compared to continuous methods. These factors make it less ideal for multi-width or high-precision tolerance applications without additional steps. A representative example is its application in or rubber roll production, where the lengthwise slit narrower rolls can be further processed into uniform sheets or strips for uses like insulation or gaskets, enabling precise customization while preserving material integrity.

Rewind Slitting

Rewind slitting is a continuous inline process used in roll converting to cut wide master rolls of flexible materials lengthwise into narrower strips, which are immediately rewound onto separate cores for high-volume production. The master roll unwinds at a controlled speed, the web passes through a bank of cutting tools that slit it into multiple narrower webs, and these slit webs are simultaneously rewound onto individual cores under precise tension to form finished rolls. This method contrasts with batch log slitting by enabling uninterrupted operation without pausing for cuts. The primary subtypes of rewind slitting include shear slitting, slitting, and score/crush cut slitting, each suited to specific material properties and precision requirements. Shear slitting employs rotating upper and lower circular knives in a scissor-like action, where the knives overlap slightly to produce clean, burr-free edges on thicker or denser materials such as or laminates. slitting uses stationary or looped blades positioned at an to slice through the web, ideal for thin, soft materials like films and foils, though it operates at lower speeds to minimize friction and heat buildup. Score/crush cut slitting involves a hardened rotating pressed against a hardened roll to score and crush the material, providing a cost-effective option for delicate or varying-thickness films but potentially generating more particulate. Key mechanics in rewind slitting ensure material stability and roll quality throughout the process, including web guiding systems that align the material path to prevent wandering, automated tensioning controls that maintain consistent web tautness to avoid wrinkles or breaks, and differential winding speeds on individual rewind shafts to build uniform, defect-free rolls. These elements allow for precise adjustments in real-time, supporting widths from fractions of an inch to several feet with tolerances as tight as ±0.005 inches. Advantages of rewind slitting include its capability for high-speed, continuous operation—reaching up to 10,000 feet per minute in shear configurations—making it efficient for large-scale production, along with superior width control that minimizes waste and ensures consistency across batches. However, limitations arise depending on the subtype, such as potential edge burrs in shear slitting on irregular materials, dust generation in score/crush methods with brittle substrates, or feathering and debris in razor slitting at higher speeds.

Materials Handled

Soft Materials

Soft materials encompass a range of flexible substrates commonly processed in roll slitting, including , plastic films such as (e.g., LDPE, LLDPE) and PVC, metal foils like aluminum and metallized films, textiles, and non-wovens. These materials are characterized by their low rigidity and high susceptibility to deformation, necessitating specialized handling to maintain integrity during the slitting process. Slitting considerations for soft materials emphasize maintaining low web tension to prevent , tearing, or , typically in the range of 30–120 N/m for and 0.8–3.0 N/cm for coated . slitting or score (crush cut) methods are preferred over shear for these substrates, as they produce cleaner edges with minimal generation or fibrillation, particularly in and non-wovens where shear can exacerbate particle release. Unlike rigid substrates, soft materials require tapered tension profiles—often reducing by 25–50% across the roll—to ensure uniform hardness without inducing bagginess or buckling. Key challenges in slitting soft materials include web instability due to uneven tension, which can lead to misalignment; static buildup in synthetic films and foils, attracting contaminants; and edge in textiles or non-wovens from improper guidance. Solutions involve precise tension control systems, anti-static bars with active to dissipate charges, and guided rollers to stabilize the web path. For dust and fibrillation, enhanced extraction systems with filtration and air velocities of 15–20 m/s are essential, especially in high-speed operations. These materials typically range in thickness from 0.001 to 0.5 mm, allowing for high-speed slitting up to 600 m/min with optimized setups, though thinner gauges like 50 µm films may limit speeds to 250–300 m/min to avoid defects. Unique quality issues in soft material slitting include wrinkling from excessive pressure or uneven tension, and telescoping in rewound rolls where inner layers shift, particularly in inelastic films like BOPP or . techniques, at rates up to 25 mm/min per 150 m/min winding speed, help mitigate these by randomizing thickness variations and promoting even layering.

Hard Materials

Roll slitting of hard materials involves processing semi-rigid or brittle substrates that require specialized techniques to achieve clean cuts without compromising structural integrity. These materials, typically ranging in thickness from 0.1 to 2 mm, include thin metals such as steel foil and copper foil, rigid plastics like sheets, composites, and coated boards. Unlike flexible webs, hard materials demand higher tension during slitting to maintain stability, often employing shear or crush methods for precise, burr-free edges. Shear slitting, in particular, uses opposing rotary knives to produce clean shears suitable for these denser substrates, while crush slitting applies against an for thicker variants. Slower operating speeds are essential to minimize vibrational stress that could propagate fractures in brittle compositions. Key challenges in slitting hard materials stem from their inherent brittleness, which can lead to cracking, delamination in composites, or edge chipping under excessive force. For instance, polycarbonate and similar rigid plastics are prone to stress-induced fractures if blade alignment or tension is suboptimal, while metal foils may exhibit delamination in coated layers due to shear forces. Heat buildup from friction during cutting exacerbates these issues, potentially causing thermal distortion or material warping; thus, integrated cooling systems, such as spray nozzles directed at the blades, are commonly employed to dissipate heat and preserve edge quality. Quality control in hard material slitting focuses on mitigating unique defects like burr formation on metal edges or chipping in rigid plastics, which can compromise downstream usability. Burrs arise from incomplete shear separation in metals, necessitating post-slit deburring processes such as electrochemical or tumbling to smooth edges without altering dimensions. In composites and coated boards, chipping often results from inconsistent density, requiring blade materials with high hardness (e.g., ) and regular sharpening to maintain cut integrity. These measures ensure the slit rolls meet tolerances for applications in and , where edge defects could lead to .

Machinery and Equipment

Key Components

Roll slitting machinery relies on several core components to process wide rolls of material into narrower strips with precision and consistency. The primary elements include the unwind stand, slitting heads, and rewind section, which work together to feed, cut, and collect the material. These components ensure controlled material flow, accurate cuts, and uniform output rolls, essential for industries handling films, papers, and foils. The unwind stand supports the master roll and facilitates its controlled feeding into the machine. It typically features an air-expanding shaft for secure roll mounting, along with braking systems—such as pneumatic, magnetic, or motor-driven mechanisms—to maintain constant web tension and prevent material sagging or stretching during unwinding. This tension control is critical for stable , as variations can lead to misalignment or defects in the final slits. At the heart of the system, slitting heads perform the actual cutting using specialized knives mounted on shafts. Common knife types include razor blades for clean cuts on thin films like PET or BOPP, which employ sharp, straight-edged or looped configurations to slice through the material; shear knives, consisting of paired rotary blades (one slightly faster than the other) for precise shearing on papers, foils, and laminates; and score or crush knives, where a hardened presses against an for materials like adhesives or heavy papers. Spacers on the shafts allow adjustable cut widths, ensuring versatility across applications. features, such as blade guards and interlocked enclosures, protect operators from rotating hazards. The rewind section collects the slit strips onto multiple cores, using shafts to support individual rolls and mechanisms for even winding. It employs center or surface winding techniques with differential tension controls to avoid overlaps, slack, or telescoping, producing tightly wound, market-ready rolls. Cores, often made of or , are loaded onto lay-on or rider rolls that apply pressure for uniform density. Auxiliary components enhance precision and efficiency. Web guides, equipped with ultrasonic or optical edge sensors, use adjustable rollers to align the material path and minimize waste from misalignment. Tension controllers, including brakes on the unwind and nip rollers throughout, maintain consistent pull via feedback loops, preventing wrinkles or tears. Drive systems, powered by synchronized motors, regulate speeds across sections to match material flow and cutting requirements. These elements integrate in a linear configuration, with the unwind feeding material through web guides and tension controllers to the slitting heads, followed by the rewind section. Feedback loops from sensors to drive systems enable real-time adjustments for alignment and speed, ensuring seamless operation across various machine configurations. stops and guarding integrate throughout for operational .

Machine Types

Roll slitting machines are categorized primarily by their and operational capabilities, with and duplex/turret models serving as the foundational types for most industrial applications. machines feature a single-sided shaft design that allows for straightforward access during roll loading and unloading, making them particularly suitable for narrower web widths typically up to 1000 and facilitating quick changeovers in lower-volume settings. In contrast, duplex and turret machines incorporate dual or multiple rewind shafts, enabling simultaneous processing of multiple rolls and supporting continuous, high-volume production without significant downtime. Specialized variants include slitter-rewinders, which integrate cutting and rewinding functions into a single unit for efficient inline processing of materials like films and foils, and standalone slitters designed for preparatory log slitting or small-scale operations such as label conversion. High-speed lines, often tailored for thin films, incorporate advanced tension control and automation to handle delicate substrates at elevated rates. Examples of industry-standard models include Jota Machinery's thermal paper slitters and Atlas Converting's CW series primary slitter-rewinders, which exemplify reliable configurations for diverse converting needs without implying superiority. These machines typically accommodate web widths ranging from 300 mm to 3000 mm, with advanced models achieving slitting speeds up to 600 m/min or higher for optimized throughput in applications. Selection of a machine type depends on factors such as properties (e.g., flexibility or thickness), production volume (favoring turret designs for non-stop runs), and precision requirements for edge quality and slit width uniformity. Incorporating unwind and rewind sections ensures seamless flow across these types.

Applications and Advancements

Industrial Applications

Roll slitting finds extensive application across multiple industries, where it enables the precise conversion of wide master rolls into narrower widths tailored for end-use products. In the sector, it is commonly used to process films into labels, tapes, and flexible packaging materials, allowing manufacturers to produce customized widths for consumer goods such as food wrappers and tapes. The printing industry relies on roll slitting to prepare web stock from paper rolls for newspapers, magazines, and labels, ensuring uniform sizes suitable for high-speed presses. In , slitting foil into narrow strips is essential for fabricating flexible circuits and components in devices like smartphones and wearables. Similarly, the employs roll slitting for adhesives and insulation materials, such as non-woven mats for acoustic and thermal barriers in vehicle interiors. Specific uses of roll slitting highlight its role in value-added manufacturing. For instance, wide rolls are slit into narrow tapes for products like tapes and medical bandages, optimizing and reducing waste during downstream assembly. In battery production, metal foils such as aluminum and are precisely slit to form components, enabling the creation of compact lithium-ion cells for electric vehicles and portable electronics. These applications demonstrate roll slitting's versatility across soft materials like films and hard substrates like metal foils, supporting diverse product specifications. The economic impact of roll slitting is significant, as it streamlines production by converting bulk materials into usable formats, thereby minimizing excess inventory and enhancing . This process supports just-in-time in industries like and automotive, where smaller, precise rolls reduce storage needs and accelerate delivery timelines. Globally, the market for roll slitting equipment was valued at approximately USD 2.34 billion in , reflecting its in industrial supply chains. Case examples illustrate roll slitting's practical integration in key sectors. In the paper industry, large jumbo rolls of tissue are slit and rewound into smaller consumer-sized rolls for household products like and paper towels, facilitating efficient distribution and retail packaging. In textiles, non-woven fabrics are slit into widths suitable for products such as diapers and sanitary napkins, ensuring consistent quality and ease of further processing. Emerging trends in roll slitting emphasize customization for sustainable materials, including the processing of recycled plastic films and post-consumer (PCR) films to meet environmental regulations like the EU's and Packaging Waste Regulation (PPWR). This adaptation allows industries to incorporate eco-friendly substrates without compromising precision, supporting the shift toward circular economies in and beyond.

Modern Developments

In recent years, roll slitting technology has advanced significantly through the integration of and , particularly in defect detection. AI-powered vision systems utilize real-time image processing to identify edge flaws, surface imperfections, and alignment issues during the slitting , enabling immediate adjustments to minimize waste and ensure product quality. These systems, often employing algorithms for adaptive slitting, achieve near-zero loss by autonomously correcting cuts based on detected anomalies, representing a shift from manual inspections to proactive . Servo-driven controls have emerged as a key , providing precise tension management that surpasses traditional clutch-based systems by offering dynamic responsiveness and reduced mechanical wear. These controls use independent servo motors for each rewind shaft, maintaining consistent web tension across varying material speeds and thicknesses, which enhances slit edge quality and operational stability in high-volume production. Modern roll slitting machines now support high-speed operations exceeding 1200 m/min, facilitated by advanced drive systems and lightweight components that handle rolls without compromising precision. For instance, upgraded slitter rewinders for tissue and achieve stable production at these velocities, supporting industries requiring rapid throughput. Integration with Industry 4.0 principles further enables IoT-based monitoring, where sensors track , predict needs, and optimize use through , fostering factory-wide connectivity. Sustainability efforts in roll slitting emphasize eco-friendly features, such as energy-efficient drives that reduce overall consumption by approximately 30% compared to conventional models. These advancements support the processing of biodegradable materials, like films, through specialized low-heat slitting to prevent degradation while minimizing environmental impact. Waste reduction is further achieved via laser-guided cuts, which provide sub-millimeter accuracy in positioning, cutting material loss by optimizing blade alignment and reducing trim scraps. Looking ahead, hybrid machines that combine roll slitting with inline or laminating are gaining traction, allowing seamless multi-process workflows for and labels. Digital twins, virtual replicas of slitting systems, enable of tension dynamics and process parameters, optimizing setups before physical runs and reducing trial-and-error downtime. Since 2010, the surge in production has driven demand for ultra-precise roll slitting in roll-to-roll , enabling scalable fabrication of thin-film devices like solar cells and sensors. Additionally, patents on ultrasonic slitting technologies have introduced dust-free cutting methods, using high-frequency vibrations to seal edges without debris, ideal for applications in wipes and medical rolls.

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